Contemporary-control-systems Compact Managed Switches Software Manual for Web B Manual do Utilizador descarregar pdf (Página 34)

TD020851-0MG

4.4.7.1 Configure Port QoS

When QoS is enabled, Flow Control for each port can be enabled or disabled and two

levels of Port Priority applied. This is the highest method of priority and it is known as

Port QoS. For QoS to be most effective, it is recommended that each port have its flow

control disabled (the default setting). When a port is operating in half-duplex mode, flow

control is accomplished with backpressure. But in full-duplex mode, flow control is

accomplished using the PAUSE protocol. Either method of flow control can affect the

ability of a port to deliver messages and can cause some messages to be delayed.

In the 24-port switch example of Figure 29, Port 2 has been configured for “High” priority

while all other ports are set to “Normal”. But Port 1 (set to “Normal” priority) is the only

port on which Flow Control will function — because only it has had Flow Control enabled.

At the bottom of the screen there are two links to the other types of QoS.

Figure 29 — Configure Port QoS for a 24-port Switch

1 2 ... 29 30 31 32 33 34 35 36 37 38 39 ... 82 83

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Contemporary-control-systems Compact Managed Switches Software Manual for Web B Manual do Utilizador Página 34